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Brown recluse spiders, also known as violin spiders due to the violin-shaped marking on their back, are venomous arachnids found primarily in the United States. These spiders are small to medium-sized, ranging from 6 to 20 millimeters in body length. They have a distinctive light to dark brown coloration and are known for their reclusive behavior, often hiding in dark, secluded areas such as closets, attics, and basements. Brown recluse spiders are known for their necrotic venom, which can cause tissue damage and ulceration at the site of a bite.